Goal equivalent manifold analysis of task performance in non-specific LBP and healthy subjects during repetitive trunk movement: Effect of load,velocity, symmetry |
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| Affiliation: | 1. Department of Physical Therapy, Faculty of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran;2. Biomechanics Lab, Rehabilitation Research Center, and Faculty of Rehabilitation, Department of Rehabilitation Basic Sciences, Iran University of Medical Sciences, Tehran, Iran;3. Department of Ergonomics, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran;4. Department of Physical Therapy, Faculty of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran;5. Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;1. Department of Kinesiology, University of North Carolina at Greensboro, Greensboro, NC, USA;2. Division of Sports Medicine, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, USA;3. Department of Pediatrics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA;4. Center for Cognition, Action, and Perception, Department of Psychology, University of Cincinnati, Cincinnati, OH, USA;5. Gait and Motion Analysis Laboratory, Providence VA Medical Center, Providence, RI, USA;6. Department of Cognitive, Linguistic & Psychological Sciences, Brown University, Providence, RI, USA;1. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom;2. Department of Mechanical and Manufacturing Engineering, Aalborg University, Denmark;3. Department of Mechanical Engineering, University of Bath, United Kingdom;1. Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China;2. Akita International University, Yuwa, Akita-city 010-1292, Japan;3. Center for Integrated Research in Fundamental Science and Engineering, University of Tsukuba, Tsukuba, Ibaraki 305, Japan;4. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA |
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| Abstract: | Motor abundance allows reliability of motor performance despite its variability. The nature of this variability provides important information on the flexibility of control strategies. This feature of control may be affected by low back pain (LPB) and trunk flexion/extension conditions.Goal equivalent manifold (GEM) analysis was used to quantify the ability to exploit motor abundance during repeated trunk flexion/extension in healthy individuals and people with chronic non-specific LBP (CNSLBP).Kinematic data were collected from 22 healthy volunteers and 22 CNSLBP patients during metronomically timed, repeated trunk flexion/extension in three conditions of symmetry, velocity, and loading; each at two levels. A goal function for the task was defined as maintaining a constant movement time at each cycle. Given the GEM, flexibility index and performance index were calculated respectively as amounts of goal-equivalent variability and the ratio of goal-equivalent to non-goal-equivalent variability.CNSLBP group was as similar as healthy individuals in both flexibility index (p = 0.41) and performance index (p = 0.24). Performance index was higher in asymmetric (p < 0.001), high velocity (p < 0.001), and loaded (p = 0.006) conditions.Performance and flexibility in using motor abundance were influenced by repeated trunk flexion/extension conditions. However, these measures were not significantly affected by CNSLBP. |
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| Keywords: | Goal equivalent manifold Motor abundance Variability Low back pain Performance |
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